4-20Samsung ElectronicsIndoor unit display X (Operation) X (Defrost) (Timer) (Filter)Symptom The indoor unit floating sensor is open and that state is maintained for more than one minuteFailure Increase in the drain pan water level due to failure of the indoor unit drain pump,or float sensor failure4-3-5 Indoor unit float sensor errorNoNoNoNoNoYesYesYesYesYesYesRemove the floating sensorconnector connected to the indoor unitPCB and the resistance measured between thetwo terminals. Is the resistance ∞?(open circuit)Is the water level in the drain pan high?Does drain pump operatewhen compressor operates?Same error occurs againNoDrain pump PCBIs the terminal voltage aroundAC 220V?Is the water level indrain pan decreasing?Reset the indoor unit power andcheck the operation of the drain pump.(it vibrates when operating)Normal operationReplace the indoor unit PCBReassemble the floating sensorconnector and reset the outdoor unitpower. (Indoor unit power reset isrequired)Normal operationReplace the floating sensorwhen it fails and reset theindoor unit powerReplace the drain pumpReplace the drain pump Replace the indoor unit PCBError occurs• Float sensor error is cleared onlywhen the indoor power is reset
